Crank-shaft-truing device



A. M. COOK AND S. MOWER.

CRANK SHAFT mums DEVICE.

APPLICATION FILED MAY 25, 1920- 1,408,07 Patented Feb. 28, 2.

2 SHEETSSH "min a Q 4, M Coo/r I J NNNNN O R M 5 A. M. COOK AND s. MOWER. CRANK SHAFT-TRUING DEV-ICE.- APPLICATION flLED M125. 1920.

' 1,40j8; 0*'7:8=.. Patented Feb. 28,11922'.

WITNESS:

UNITED STATES PATENT OFEIQEL.

ARCH M. COOK AND SAMUEL IVEOWER, OF SPRING HILL, KANSAS.

CRANK-SHAFT-TRUING- DEVICE.

Specification of Letters Patent. Patented Feb. 28, 1922.

Application filed May 25, Serial No. 38 L110.

To all whom it may concern:

Be it known that we Anon M. Cook and SAMUEL Mownn, citizens of United States of America, residing at Spring Hill, in the county of Johnson and State of Kansas, have invented new and useful Improvements in lrank-Shaft-Truing Devices, of which the following is a specification.

This invention relates to devices for truing engine crank shafts and aims to provide a device by means of which cranks, crank pins and the like may be properly trued without the removal of the shaft from the engine.

Another object is the provision of a de vice which may be easily secured to the connecting rod of the piston in place of the connecting rod cap and the shaft rotated to properly true the crank or pins.

Another object is the provision of a device of the above characterwhich may be applied to connecting rods of different sizes and which. may be adjusted to shape the crank or pin to the desired diameter.

Other objects and advantages of the invention will appear as the following description is read in connection with the accompanying drawings.

- In the drawings Figure l is a sectional view through the crank shaft of the engine with the invention applied, the latter being shown in side elevation.

Figure 2 is a similar view showing the device" in section.

Figure 3 is a view looking toward the end of the connecting rod with the device in position.

Figure 4: is a detailed perspective view of the holder.

Figure 5 is a detailed perspective View of the adjusting member.-

Figure 6 is a similar view of the cutting blade.

Referring to the drawings in detail, wherein like characters of reference denote corresponding parts, the reference character 10 designates the crank shaft of an engine, 11. the crank or pinand 12 the usual con necting rod which serves to connect the crank shaft to'the piston of the engine@ The invention which is designated in its entirety by the reference character 12 includes a holder 1% which is provided with an annular groove 15 positioned transversely of the holder, the transverse section of the latter being'of rectangular configuration. Extending from opposite sides of the holder are cars 16, which are provided with open ended slots 17; these slots are adapted to receive the bolts which usually serve as .a means for connecting the connecting rod cap in position. By providing slots of the character shown, the holder may be secured to connecting rods of different sizes.

.The holder 14- is oppositely beveled upon each side of the slot 15 as indicated at 18 to provide for the reception of the crank or pin of the shaft, while located within the slot 15 between the beveled surfaces 18 is a cutting blade 19. This blade is beveled to provide a cutting edge and the edges inclined as shown for the purpose of pr0viding a shearing cut. The inner end of the blade is cut away to provide parallel lugs 20 and when the blade is positioned within the holder these lugs will be received within the opposite side portions of the inner groove 15.

Also located within the groove 15 and capable of adjustment therein is a substantially U shaped adjusting member 21, the parallel arms of this member being adapted for contact with the lugs 20 of the cutting member to limit the inward movement of the latter. The adjusting member is held in position by means of a set screw 22 orsimilar fastening device.

In the use of the invention, the cap connecting rod is removed and the holder connected to the said cap by means of the bolts previously mentioned. The blade 19 may be then adjusted through the medium of the set screw to properly position its cutting blade with respect to the crank or pin. The

shaft may be then rotated until the crank or pin has been brought to the proper shift.

Having described the invention what is claimed is 1. A device for truing engine crank shafts comprising a holder having a transverse groove therein, a blade positioned within the groove and capable of sliding movement therein, means for securing the holder to the connecting rod of an engine, a U -shaped member positioned within the groove for contact with the blade and means for adjustably securing the U shaped member in curing the holder to a piston connecting rod ting blade and means for holding the adin a manner to operate part of the connectjusting member in position. 7

ing rod bearing a U-shaped cutting blade In testimony whereof we afiix our signa- 10 slidable Within the transverse groove, a tures.

U-shaped blade adjusting member also movable Within the groove and arranged re- ARCH M. COOK.

versely to and abutting the ends of the cut- SAMUEL MOWVER. 

